President Donald Trump said Saturday that North Korean leader Kim Jong Un has a “one-time shot” to show he’s serious about a nuclear disarmament deal.

“I feel that Kim Jong Un wants to do something great for his people and he has that opportunity,” Trump said at a press conference just before he departed a G-7 summit in Charlevoix, Canada, for his historic Tuesday rendezvous with Kim in Singapore. “He won’t have that opportunity again.”

Trump’s carrot-and-stick rhetoric on North Korea matched his message for the G-7 on trade. After a week in which he exchanged pointed barbs with some leaders of other G-7 nations — Canada, the U.K., France, Italy, Japan and Germany — Trump said Saturday that he is confident he can get them to rectify trade imbalances he believes are harmful to American workers.